Nut-lock.



No. 896,901. PATENTED AUG. 25, 1908. H. DUBROW & J. YURKOVIGH.

NUT LOCK.

APPLICATION FILED PEB.13, 1908.

/f 5444: Mama n45 NORRIS PETERS co., WASHINGTON, n c.

HARRY DUBROW AND JAKE YURKOVIOH, OF ALLEGHENY, PENNSYLVANIA.

NUT-LOCK.

Specification of Letters Patent.

Patented Aug. 25, 1908.

Application filed February 13, 1908. Serial No. 415,739.

To all whom it may concern.

Be it known that we, HARRY DUBROW and JAKE YURKOVICH, citizens of theUnited States, residing at Allegheny, in the county of Allegheny andState of Pennsylvania, have invented certain new and useful Improvementsin Nut-Locks; and we do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in nut locks andhas for its principal object the production of simple and efficientoperating means for positively lockin the nut against reverse rotationonthe bolt, thus obviating liability of the former working loose orbecoming displaced from the latter and the disastrous results incidentthereto.

In the accompanying drawings in which like parts are designated .by likecharacters throughout the several views, Figure 1 is a view in sideelevation of a nut lock embodying our improvements. Fig. 2 is alongitudinal sectional view taken on line 22 of Fig. 3 looking in thedirection indicated by the arrow. Fig. 3 is a cross section taken on theplane indicated by the dotted lines 33 of Fig. 1, looking in thedirection indicated by the arrow. Fig. 4 is a view in side elevation ofthe pawl disengaging means. Fig. 5 is an end elevation of Fig. 4, and,Fig. 6 is a detail view of a retaining plate employed in carrying outthe invention.

In the embodiment illustrated the threaded portion of the bolt body 1 isformed with a series, preferably four, of longitudinally extendinggrooves 2. The outer face of the nut 3 is formed with a relatively largerecessed portion 3 in which is pivotally mounted, preferably atdiagonally opposite corners, locking pawls 4, the free ends of thelatter being designed to engage with either of the grooves 2 of the boltbody, the arrangement of the pawls being such that the operator ispermitted to screw the nut on the bolt but in attempting to unscrew thesame therefrom, the free ends of the locking pawls will engage with thegrooves of the bolt body and prevent reverse rotation of the nut. Saidpawls are normally held in interlocking engagement with the grooves 2 byflat springs 5, the outer ends of which bear upon the inner face of theshoulder or flange 6 formed by recessing the nut and the inner oropposite ends of which extend or fit into correspondingly obliquelydisposed slots or sockets 7 formed in and near the pivot ends of thelocking pawls.

One of the principal features of the invention resides in the provisionof means operable to disengage the pawls from the grooves of the boltbody. As shown, this means is in the form of a member comprising acylindrical body 8 formed at its inner end with an outwardly extendingflange 9 of preferably annular formation, and at its outer or oppositeend or face with a headed portion 10 which as shown is of hexagonalform.

In carrying out the invention, the inner.

face of the flange 9 is formed, preferably at diametrically oppositepoints, with engaging pins or lugs 11 the purpose of which will bedisclosed.

The pawl disengaging member above described is formed throughout itslength with a bore 12 to receive the body portion of the bolt and isarranged in position by inserting the flange end thereof within therecessed face of the nut, the engaging pins or lugs 11 being arranged inposition to engage the free ends of the locking pawls.

To protect the nut locking means and to retain the pawl disengagingmember in position, a keeper plate 13 is arranged over the recessed faceof the nut, said plate being formed with a central opening for thereception of the body portion 8 of the pawl disengaging member, and atdiagonally opposite points with screw receiving apertures 15 throughwhich are inserted fastening screws 16, said screws screwing incorresponding threaded sockets 17 formed in the recessed portion and atdiagonally opposite points of the nut.

To remove the nut from position, it is only necessary that the pawldisengaging member be turned a fraction of a revolution in a left handeddirection to effect the disengagement of the free ends of the lockingpawls from the grooves of the bolt body, after which operation the nutmay be readily unscrewed from position. It will also be perceived thatthe nut, having once been screwed in position, liability of its becomingdisplaced is positively insured against because of the groove engagingmeans carried by the nut.

From the foregoing description taken in connection with the drawings, itis thought that the construction and operation of the invention will bereadily understood without requiring a more extended explanation.

We claim as our invention:

1. In combination with a longitudinally grooved bolt body, a nut formedin its outer face with a relatively large recessed portion mountedthereon, spring pressed locking pawls pivotally mounted in the recessedportion of the nut to normally engage with the grooves of the bolt body,a pawl disengaging member rotatably mounted upon the bolt body, saidmember comprising inwardly extending pins which project into therecessed portion of the nut and are adapted to disengage the pawls fromthe grooves of the bolt body when turned in one direction, and a keeperplate detachably arranged over the recessed portion of the nut to retainthe pawl disengaging member in operative position.

2. In combination with a bolt body formed with a series oflongitudinally extending grooves, a nut formed in one face with arelatively large recessed portion mounted thereon, spring pressedlocking pawls pivotally mounted in the recessed portion of the nut tonormally engage with the grooves of the bolt body, a pawl disengagingmember rotatably mounted upon the bolt body, said member comprising acylindrical body formed at its outer face with an outwardly projectingheaded ortion and at its inner face with an annu ar flange adapted tofit in the recessed portion of the nut and to bear upon the pawls andwith inwardly extending pins which project into the recessed portion ofthe nut and are adapted to disengage the pawls from the bolt body whenthe pawl disengaging member is turned in one direction, and a keeperplate mounted 40 upon the body portion of said member and detachablyconnected with the recessed face of the nut to retain the former inoperative position. i

In testimony whereof we have hereunto 45 set our hands in presence oftwo subscribing witnesses.

HARRY DUBROW. JAKE YURKOVICH. Witnesses:

LEE NYE,

ANDREW MoRRow.

